Using a plus sign is subaddressing [1] and most ESPs[2] will route to the main address ( [email protected]) . So you can use use [email protected], [email protected] and both will route the email to you.

In my experience most SaaS apps do not filter this out and allow re-sign ups with sub-addresses.

Gmail has an additional behavior that dot character is ignored in local component of the address . [email protected], [email protected] [email protected] all route to the same inbox as well.

[1] https://datatracker.ietf.org/doc/html/rfc5233 [2] Less common in work hosted ESPs but almost universally default enabled in public ESPs for consumers.

This is not true (anymore?). I have a rather unfortunate exact naming collision with a family member. They use the full name without dot for the local gmail component, I use a dot between the first and last name.

Two or three mails have been misplaced in a decade.

It is still the rules for Gmail (https://support.google.com/mail/answer/7436150?hl=en).

It would be feasible to change something like that without breaking security now.

Google can hardly start allowing/routing a new account for [email protected] when you were getting it for years even though your account is [email protected] and sensitive communication like say from your bank would routed there.

icloud+ hide my email for $0.99

One can consult the oracle, /dev/random